Patent GB-190415686-A (GB)
Title: Improvements in Machines for Corrugating or Gathering and Sewing Tubular and like Fabrics, such as the Heads of Mantles for Gas Lighting by Incandescence.
Inventor: COHN SAMUEL
Filed: 1904-07-14
Granted: 1905-10-14
Abstract: 15,686. Cohn, S. July 14. Incandescentlamp-mantle sewing- machines ; running- stitch machines ; sack seaming machines; needlethreaders.-Relates to a machine for gathering and sewing the tops of incandescent gas mantles, and also applicable to sewing the mouths of bags and other tubular fabrics. The mantle is placed over jaws c, d, Fig. 14, between outer jaws a, b. The jaws a, d and b, c are then closed so as to grip the mantle between corrugations with which they are furnished. These corrugations are provided with vertical slots, through which two needles o are passed. These needles do not carry threads but, the needles having passed through the material, hooks v, v<1> draw the free ends of a thread loop through the needle eyes, which are made resilient so as to retain the thread, and, on their descent, the needles draw the loop through the corrugations of the material. This thread is drawn up and secured by hand after the mantle is removed. Small springs are laid in the troughs of the corrugations of the jaws c, d, to eject the mantle when the jaws are separated. One machine may comprise any number of sets of jaws. The centre jaws c, d, Fig. 2, are carried by stationary spring arms c<2>, d<1>, and the outer jaws a, b by springs a', c<4> carried by slides c', c<5>. When the mantle is placed in position, the slides c<1>, c<5> and the outer jaws are advanced by a bar e<2> which is actuated, through a lever e<3>, by a cam on the main shaft, and then slides c<3>, c<6>, c<7> are similarly advanced by a bar e<8>. The slide c<3> is pointed and, engaging the springs c<3>, d<1>, separates the jaws c, d at the same time that the slides c<6>, c<7>, suitably curved, similarly close the outer jaws a, b. The needles are carried by a bar o', which moves in vertical guides and is actuated through suitable rods by a cam. A bar f is carried by springs at a suitable height to act as a stop for the needle-bar. The needle-threading hooks are carried by slides provided with oppositelyinclined slots v<11>, v<12> which engage pins v<13> fixed to the slides c<6>, c<7>. These slides are moved to and fro by bars v<5>, v<6> which are actuated by cams. In the first part of the operation, the bars v<5>, v<6> move forwards with the slides c<6>, c<7> so that there is no relative movement, but, afterwards, suitable movement is given to them to cause the hooks to thread the needles. The machine is caused to rotate half a revolution at a time ; after the first half revolution, when the needles have pierced the material, the thread loop is placed in position, by hand, over two adjacent rollers ; immediately the machine re-starts, the loop is held in place by a third roller, which is lowered upon it by means of a cam. The free end of the mantle is placed between two rollers, one of which is shown at x, and, when the operation is completed, these are rotated by a camactuated pawl which engages a ratchet-wheel geared to one of the rollers. To produce the intermittent motion, the machine is driven through a clutch, Fig. 9, in which a sleeve z is fixed to the shaft and has a feather z' which is moved to engage a projection on the boss of a driving-wheel loosely mounted on the shaft. To start the machine, the plates z<11>, z<12> are, together, momentarily opened, by a treadle rod attached to an arm z<10>, so as to free the feather, which has been retained by the plate z<11> acting on a pin z<31>, and to permit a spring to force it into engagement with the driving-wheel. In the second quarter of the revolution, the pin z<31> bears against the cam-face of the plate z<12>, the feather is withdrawn, and the machine disengaged. In a modification, the inner jaws c, d are replaced by a solid member having jaws on both sides. It is tapered to facilitate the placing of the mantle, and the needle -slots open towards the end of the member, to allow the ready withdrawal of the mantle.